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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 30, 2012
Apr. 01, 2011
Cash flows from operating activities:    
Net income $ 1,530 $ 766
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 4,768 3,922
Provision for doubtful accounts 1,049 576
Stock-based compensation 2,902 2,575
Deferred income taxes (1,006) 690
Other operating activities (401) (527)
Changes in operating assets and liabilities:    
Accounts receivable 8,441 (12,294)
Income taxes 1,037 (1,264)
Other assets 1,076 458
Accounts payable and other accrued expenses (2,644) (2,547)
Accrued wages and benefits 1,513 3,695
Workers' compensation claims reserve (876) (542)
Other liabilities 303 (103)
Net cash provided by (used in) operating activities 17,692 (4,595)
Cash flows from investing activities:    
Capital expenditures (3,704) (1,691)
Change in restricted cash and cash equivalents 3,529 (635)
Purchases of restricted investments (7,662) (3,106)
Maturities of restricted investments 3,907 0
Net cash provided by (used in) investing activities (3,930) (5,432)
Cash flows from financing activities:    
Net proceeds from sale of stock through options and employee benefit plans 2,894 424
Common stock repurchases for taxes upon vesting of restricted stock (1,807) (1,460)
Payments on debt 0 (103)
Other 637 541
Net cash provided by (used in) financing activities 1,724 (598)
Effect of exchange rates on cash 208 262
Net change in cash and cash equivalents 15,694 (10,363)
CASH AND CASH EQUIVALENTS, beginning of period 109,311 163,153
CASH AND CASH EQUIVALENTS, end of period $ 125,005 $ 152,790